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Decomposition of Al2TiO5-MgTi2O5 solid solutions: a thermodynamic approach

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Abstract

The decomposition of Al1−xMgxTi1+xO5 solid solutions with x=0.0, 0.1, 0.2, 0.4, 0.5 and 0.6 was studied in the temperature range 900–1175 °C using a 250 h annealing test. As x increases from 0–0.2 there is a strong stabilizing effect and the decomposition temperature decreases from 1280 °C (Al2TiO5) down to ≈ 1125 °C. For 0.2⩽x⩽0.5 the decomposition temperature does not decrease further. For x=0.6 no decomposition was observed. For x⩽0.5 decomposition is complete or almost complete at 1000 °C; at 900 °C transformation is kinetically hindered and solid solutions with x=0.2 and 0.4 are unaffected by the thermal treatment. A relationship between the decomposition temperature and the parameter x has been derived using the regular solution model to describe the Al2(1−x)MgxTi(1+x)O5 solid solution.

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Authors and Affiliations

  1. Istituto di Chimica Fisica Applicata dei Materiali-Consiglio Nazionale delle Ricerche, via De Marini 6, I-16149, Genoa, Italy

    V. Buscaglia, G. Battilana & M. Leoni

  2. Facoltà di Ingegneria, Istituto di Chimica, Fiera del Mare, Pad. D, I-16129, Genoa, Italy

    P. Nanni

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  1. V. Buscaglia
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  2. G. Battilana
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  3. M. Leoni
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  4. P. Nanni
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Buscaglia, V., Battilana, G., Leoni, M. et al. Decomposition of Al2TiO5-MgTi2O5 solid solutions: a thermodynamic approach. JOURNAL OF MATERIALS SCIENCE 31, 5009–5016 (1996). https://doi.org/10.1007/BF00355899

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  • DOI: https://doi.org/10.1007/BF00355899

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